Fig.2: The plot of the 573 K offset yield stress vs. reduction of area after drawing for nickel– chromium alloy tubular specimens of Sets A, B, and C. The film is zirconia 1.5 µm thick Fig.3: The ultimate strain in drawing vs. reduction of area at 573 K for nickel–chromium alloy tubular specimens of Set. A, B, and C. The film is zirconia 1.5 µm thick For uncoated materials, the offset yield stress and ultimate strength increase to attain the maximum value when the reduction of area is 42%, then decreases; when the reduction of area is larger than 54%, the specimen is broken in drawing, being lengthwise separated into fibers. The yield stress values
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